A first subject of the present disclosure is a special oxidant preparation for oxidative coloring of keratinous fibers, more particularly human hair, included in a cosmetic carrier(A) hydrogen peroxide and(B) at least one acid from the group of sulfuric acid, hydrochloric acid, phosphoric acid, lactic acid, citric acid, malic acid, tartaric acid, maleic acid, succinic acid, oxalic acid, ascorbic acid, phytic acid, gluconic acid, nitric acid, malonic acid, acetic acid and-or C3-C22 alkane carboxylic acids,wherein the oxidant preparation has a pH value of from about 0.5 to about 3.0.Additional subjects of the present disclosure are methods for oxidative color changing of human hair in which this special oxidant preparation is used.
